[Bug target/90178] [9 Regression] Missed optimization: duplicated terminal basic block with -mavx
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90178 --- Comment #8 from hjl at gcc dot gnu.org --- Author: hjl Date: Sun Apr 21 18:23:00 2019 New Revision: 270484 URL: https://gcc.gnu.org/viewcvs?rev=270484&root=gcc&view=rev Log: LRA: Revert "Remove useless move insns" Useless move insn removal was added to LRA just to avoid wasting CPU cycles on such insn processing afterwards. Such insns are removed anyway later in the pass pipeline. The CPU time savings are tiny but the removal creates too many problems including PR target/90178. Vladimir pre-approved the patch to remove the code: https://gcc.gnu.org/ml/gcc-patches/2019-04/msg00834.html gcc/ PR target/90178 Revert: 2018-11-21 Uros Bizjak Revert the revert: 2013-10-26 Vladimir Makarov Revert: 2013-10-25 Vladimir Makarov * lra-spills.c (lra_final_code_change): Remove useless move insns. gcc/testsuite/ PR target/90178 * gcc.target/i386/pr90178.c: New test. Added: trunk/gcc/testsuite/gcc.target/i386/pr90178.c Modified: trunk/gcc/ChangeLog trunk/gcc/lra-spills.c trunk/gcc/testsuite/ChangeLog
[Bug target/90178] [9 Regression] Missed optimization: duplicated terminal basic block with -mavx
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90178 H.J. Lu changed: What|Removed |Added Status|NEW |RESOLVED Resolution|--- |FIXED Target Milestone|--- |9.0 --- Comment #9 from H.J. Lu --- Fixed.
[Bug target/90178] [9 Regression] Missed optimization: duplicated terminal basic block with -mavx
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90178 Jakub Jelinek changed: What|Removed |Added Status|RESOLVED|REOPENED CC||jakub at gcc dot gnu.org Resolution|FIXED |--- --- Comment #10 from Jakub Jelinek --- The patch has been reverted (and is not the right fix anyway).
[Bug target/90178] [9 Regression] Missed optimization: duplicated terminal basic block with -mavx
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90178 --- Comment #11 from Jakub Jelinek --- Author: jakub Date: Mon Apr 29 14:18:55 2019 New Revision: 270653 URL: https://gcc.gnu.org/viewcvs?rev=270653&root=gcc&view=rev Log: PR rtl-optimization/90257 * cfgrtl.c (flow_active_insn_p): Return true for USE of a function return value. Revert the revert: 2019-04-21 H.J. Lu PR target/90178 Revert: 2018-11-21 Uros Bizjak Revert the revert: 2013-10-26 Vladimir Makarov Revert: 2013-10-25 Vladimir Makarov * lra-spills.c (lra_final_code_change): Remove useless move insns. Modified: trunk/gcc/ChangeLog trunk/gcc/cfgrtl.c trunk/gcc/lra-spills.c
[Bug target/90178] [9 Regression] Missed optimization: duplicated terminal basic block with -mavx
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90178 Bug 90178 depends on bug 90257, which changed state. Bug 90257 Summary: [10 Regression] 8% degradation on cpu2006 403.gcc starting with r270484 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90257 What|Removed |Added Status|WAITING |RESOLVED Resolution|--- |FIXED
[Bug target/90178] [9 Regression] Missed optimization: duplicated terminal basic block with -mavx
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90178 Jakub Jelinek changed: What|Removed |Added Target Milestone|9.0 |9.2 --- Comment #12 from Jakub Jelinek --- GCC 9.1 has been released.
[Bug target/90178] [9 Regression] Missed optimization: duplicated terminal basic block with -mavx
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90178 Richard Biener changed: What|Removed |Added Priority|P3 |P2 Known to work||10.1.0, 8.4.1 Target||x86_64-*-*
[Bug target/90178] [9 Regression] Missed optimization: duplicated terminal basic block with -mavx
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90178 Jakub Jelinek changed: What|Removed |Added Target Milestone|9.2 |9.3 --- Comment #13 from Jakub Jelinek --- GCC 9.2 has been released.
[Bug target/90178] [9 Regression] Missed optimization: duplicated terminal basic block with -mavx
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90178 Jakub Jelinek changed: What|Removed |Added Target Milestone|9.3 |9.4 --- Comment #14 from Jakub Jelinek --- GCC 9.3.0 has been released, adjusting target milestone.
[Bug target/90178] [9 Regression] Missed optimization: duplicated terminal basic block with -mavx
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90178 Richard Biener changed: What|Removed |Added Target Milestone|9.5 |10.0 Status|REOPENED|RESOLVED Resolution|--- |FIXED Known to fail||9.5.0 --- Comment #16 from Richard Biener --- Fixed for GCC 10.
[Bug target/90178] [9 Regression] Missed optimization: duplicated terminal basic block with -mavx
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90178 Richard Biener changed: What|Removed |Added Target Milestone|9.4 |9.5 --- Comment #15 from Richard Biener --- GCC 9.4 is being released, retargeting bugs to GCC 9.5.
